The 3RT1 contactors are suitable
for use in any climate.
They are safe from touch to
DIN VDE 0106 Part 100.
The 3RT1 contactors are available
with screw connections or
with Cage Clamp connections.
An auxiliary contact is integrated
in the basic unit of size
S00 contactors. The basic units
of sizes S0 to S3 only contain
the main conducting paths.
All the basic units can be
extended with auxiliary switch
blocks. Cabinet units with 2 NO
+ 2 NC (terminal designations
acc. to EN 50 012) are available
as of size S0; the auxiliary
switch block is removable.
The size S3 contactors have
removable box terminals for the
main conductor connections.
Ring cable lugs or bars can
thus also be connected.

CONTACT RELIABILITY

If voltages = 110 V and currents
= 100 mA are to be switched,
the auxiliary contacts of 3RT1
contactors and 3RH11 contactor
relays should be used to
ensure good contact stability.
These auxiliary contacts are
suitable for electronic circuits
with currents = 1 mA at a voltage
of 17 V.
For the short-circuit protection
of contactors without an overload
relay, see the technical
data.

SHORT CIRCUIT PROTECTION OF CONTACTORS

For the short-circuit protection
of contactors with an overload
relay, see section 3.

MOTOR PROTECTION

3RU11 overload relays can be
mounted onto the 3RT1 contactors
for protection against overloads.
The overload relays must
be ordered separately (see
section 3).

SURGE SUPPRESSION

The 3RT1 contactors can be
retrofitted with RC elements,
varistors, diodes or diode
assemblies (combination of an
interference suppression diode
and a Zener diode for short tripping
times) for suppressing
opening surges in the coil.
The surge suppressors are
plugged onto the front of size
S00 contactors. Space is provided
for them next to a snapon
auxiliary switch block.
With all size S0 to S3 contactors,
varistors and RC elements
can be plugged on directly at
the coil terminals, either on the
top or underneath. Diode
assemblies are available in two
different designs with different
polarities. Depending on the
application, they can be
attached either only on the bottom
(assembly with circuitbreaker)
or only on the top
(assembly with overload relay).
The plug-in direction of the
diodes and diode assemblies is
determined by a coding
device. Exceptions:
3RT19 26-1T.00 and
3RT19 36-1T.00; in these cases
the plug-in direction is identified
by "+" and "–".
Coupling relays are supplied
either without surge suppression
or with a varistor or diode
connected as standard,
according to the design.

Note

The opening times of the NO
contacts and the closing times
of the NC contacts increase if
the contactor coils are protected
against voltage peaks
(interference suppression
diode 6 to 10 times; diode
assemblies 2 to 6 times; varistor
+2 ms to 5 ms).